M&T/Llano Seco Fish Screen Short-term/Long-term Project
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M&T/Llano Seco Fish Screen Short-term/Long-term Project. WORKSHOP #5, 9-3-08. A CALFED BAY-Delta Authority Funded Project. Sponsored by: Ducks Unlimited, Inc. MEI. M&T PROBLEM. Fish Screen Velocity and Intake Burial Solutions 1. Relax the fish screening criteria

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M&T/Llano Seco Fish Screen Short-term/Long-term Project

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M&T/Llano Seco Fish Screen Short-term/Long-term Project

WORKSHOP #5, 9-3-08

A CALFED BAY-Delta Authority Funded Project

Sponsored by: Ducks Unlimited, Inc.



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M&T PROBLEM

  • Fish Screen Velocity and Intake Burial

  • Solutions

    1. Relax the fish screening criteria

    2. Evaluate a range of solutions that meet fish screen criteria (in-channel) or eliminate the need for fish screens(out-of-channel)


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  • Progressive meander migration

  • Downstream

  • By 1942, outside of bend reaches pump site

  • Continues to move downward

  • Outside of bend “slides” along pump site

Eric Larsen UC Davis


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Eric Larsen UC Davis


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2003 Photo

1979 Photo

1979 Photo

MEI




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Gravel Bar – 2007 Condition

Eroding

Bank

M&T

Pumps




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CAUSES OF THE PROBLEM

  • Downstream bar migration

    850 ft in 6 yrs (1995-2001): Rate = 140’/yr (Stillwater Sciences, 2001) – 60’/yr (Larsen/DWR) – 60-80’/yr (Corollo)

    Recent rates reduced by dredging of gravel bar (2001, 2007): 300,000 t.

  • Bank erosion and river migration

    ~ 400 ft in 10 yrs (1996-2006)


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Project Objectives

1. To obtain an authoritative and unbiased description of the state of scientific knowledge related to Sacramento River meander, fish screen and pumping plant technology by convening a multidisciplinary team of experts in the fields of fluvial geomorphology, sediment transport, hydraulic modeling, fish screen and pumping plant technology.

2. To provide an opportunity for stakeholders and scientists to test and refine an understanding of the potential for unintended effects between managing the natural riverine system, fisheries requirements and pumping requirements.  

3. To conduct an exhaustive literature search, fill identified data gaps and conduct modeling to provide important data essential to answering specific questions that support a strong research approach in accomplishing the primary project goal.

4. To determine performance measures/indicators that will guide the long-term solution in meeting the primary project goal.

5. To fully document the investigative process of determining, identifying and justifying the long-term solution that will meet the primary goal of the project.



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RANKING CRITERIA

  • Ability to provide reliable water supply (150 cfs; 40,000 A-F/YR)

  • Ability to let river meander

  • Ability to meet fish screen criteria

  • Engineering Feasibility

  • Capitol Costs

  • Operation and Maintenance Costs

  • Compatibility with City of Chico wastewater outfall needs


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Scientific Panel

  • Yantao Cui, Ph.D. Research Scientist -Hydrology/Geomorphology

  • Michael Harvey, Ph.D., P.G. FluvialGeomorphologist

  • Eric Larsen, Ph.D. Research Scientist-Geology

  • Robert Mussetter, Ph.D., P.E. Hydraulic Engineer

  • Dennis Dorratcague, P.E. Civil Engineer (MWH)has assisted with engineering analysis and costing throughout the project


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Project Stakeholders

  • M&T Chico Ranch

  • Llano Seco Ranch

  • U. S. Fish & Wildlife Service – Sacramento National Refuge Complex

  • California Department of Fish & Game

  • City of Chico


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WORKSHOP 1 Nov. 2003

  • Alternative Water Supplies

    -Groundwater wells

    -Ranney Collector

    -City of Chico Wastewater

    -Butte Creek Diversion

  • Change Point of Diversion

    -Upstream & Big Chico Creek

  • Additional “T” fish screens

    -Upstream & across-stream

  • Bank Stabilization


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FOLLOW-ON STUDIES

  • Feasibility of groundwater wells

  • Costs for alternatives

  • Feasibility of “T” screens

  • Economic and legal issues

  • Evaluation of water supply & demand

  • Impacts on City of Chico WWTP outfall

  • River meander and sediment transport modeling


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WORKSHOP 2 March 2004

  • Infiltration galleries

  • Extended intakes d/s and across-stream

  • In-conduit fish screens

  • Dredging w/ modified fish screens

  • Rock Dikes

  • Multiple production wells

  • Ranney Collectors


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OUTCOME

  • Reject

    - Extended intakes

    - In-conduit screens

    - Infiltration galleries

    - Multiple production wells

  • Carried Forward

    - Dredging & modified screens

    - Spur dikes

    - Ranney Collectors


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ADDITIONAL STUDIES

  • Two-dimensional modeling

  • Meander modeling

  • Drilling of test wells


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Workshop 3: February 2005

  • 3-4 Ranney wells

  • Dredging/fish screen modification

  • Spur dikes

  • ADDITIONAL STUDIES

  • 4 Feasibility studies to inform alternatives

  • Refine meander analysis (50-yrs) (impacts)

  • Enviro. Documentation- gravel bar dredge

  • Feasibility of interim stabilization


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WORKSHOP 4: April 2006

  • No Action

  • 3-4 Ranney wells ($20-26M) ($~ 30 A-F)

  • 1-2 Ranney wells (can’t supply 30,000 AF)

  • 8 Dikes

  • 9 Dikes

  • 9 dikes extended ($7.5 -$12M) ($13 AF)

  • 3 dredge alternatives ($8.6M) ($15 AF)



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ADDITIONAL STUDIES & ACTIONS

  • 2-D model to evaluate u/s and d/s impacts of dikes and removal of rock revetments

  • Additional meander modeling to predict impacts of rock removal

  • Physical modeling to evaluate dredging and spur dikes

  • Interim bank stabilization

  • Removal of gravel bar


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CALFED EXPENDITURES

  • 1997 New pumping plant and screens $5M

  • 2001 Gravel bar dredging $400,000

  • 2007 Gravel bar dredging $ 409,000

  • 2007 Interim bank stabilization $620,000

  • 2003 – 2008 Studies $1.4M

  • TOTAL EXPENDITURE (1997-2008) $8.3M







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2-D Modeling to evaluate upstream and downstream impacts of dikes and to evaluate effects of river meandering on the M&T overflow weir

MEI

M&T Weir


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PHYSICAL MODELING dikes and to evaluate effects of river meandering on the M&T overflow weir1:75 Froude-scale Model


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DIKES dikes and to evaluate effects of river meandering on the M&T overflow weir


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CURRENT STATUS dikes and to evaluate effects of river meandering on the M&T overflow weir

  • No Action alternative

  • Eliminated dredging alternatives

  • 9 Dike alternative

  • Move pumping plant

    - ~ 2,200 ft

    - ~ 3,500 ft


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Proposed Dike dikes and to evaluate effects of river meandering on the M&T overflow weirField (100-200 ft-long )

MEI


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RED RIVER, LA DIKE dikes and to evaluate effects of river meandering on the M&T overflow weir


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Sacramento River Bridge @ Butte City Br. No. 11-0017 dikes and to evaluate effects of river meandering on the M&T overflow weir

Before Dikes 2004


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During high flows Feb, 2006 dikes and to evaluate effects of river meandering on the M&T overflow weir


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BUTTE CITY DIKE dikes and to evaluate effects of river meandering on the M&T overflow weir


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RED RIVER, LA DIKE ~ 200 FT LONG dikes and to evaluate effects of river meandering on the M&T overflow weir


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RED RIVER, LA DIKE ~ 200 FT LONG dikes and to evaluate effects of river meandering on the M&T overflow weir


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Larsen (2006) Meander Modeling dikes and to evaluate effects of river meandering on the M&T overflow weir

W/ Dikes

W/O Dikes


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2200 ft dikes and to evaluate effects of river meandering on the M&T overflow weir

3600 ft

MEI


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Bank and Bar Migration RM 192.4 dikes and to evaluate effects of river meandering on the M&T overflow weir


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